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    <title>Document</title>
    <style>
        .con {
            width: 300px;
            height: 300px;
            border: 1px solid #000;
            margin: 100px auto 0;
            position: relative;
        }


        .div1 {
            width: 100px;
            height: 100px;
            background-color: gold;
            position: absolute;
            left: 30px;
            top: 30px;
            z-index: 1000;
        }

        .div2 {
            width: 100px;
            height: 100px;
            background-color: cyan;
            position: absolute;
            left: 70px;
            top: 70px;
            z-index: 1200;
        }

        .div3 {
            width: 100px;
            height: 100px;
            background-color: red;
            position: absolute;
            left: 100px;
            top: 100px;
            z-index: 1100;
        }
    </style>
</head>

<body>

    <div class="con">

        <div class="div1">1</div>
        <div class="div2">2</div>
        <div class="div3">3</div>

    </div>

    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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    <p>哈哈哈哈哈哈</p>
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